/*
 * Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
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 *
 *
 *
 *
 *
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 *
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 *
 */
package java.net;

import java.io.IOException;

/*
 * Package private implementation of InetAddressImpl for IPv4.
 *
 * @since 1.4
 */
class Inet4AddressImpl implements InetAddressImpl {

  public native String getLocalHostName() throws UnknownHostException;

  public native InetAddress[]
  lookupAllHostAddr(String hostname) throws UnknownHostException;

  public native String getHostByAddr(byte[] addr) throws UnknownHostException;

  private native boolean isReachable0(byte[] addr, int timeout, byte[] ifaddr, int ttl)
      throws IOException;

  public synchronized InetAddress anyLocalAddress() {
    if (anyLocalAddress == null) {
      anyLocalAddress = new Inet4Address(); // {0x00,0x00,0x00,0x00}
      anyLocalAddress.holder().hostName = "0.0.0.0";
    }
    return anyLocalAddress;
  }

  public synchronized InetAddress loopbackAddress() {
    if (loopbackAddress == null) {
      byte[] loopback = {0x7f, 0x00, 0x00, 0x01};
      loopbackAddress = new Inet4Address("localhost", loopback);
    }
    return loopbackAddress;
  }

  public boolean isReachable(InetAddress addr, int timeout, NetworkInterface netif, int ttl)
      throws IOException {
    byte[] ifaddr = null;
    if (netif != null) {
          /*
           * Let's make sure we use an address of the proper family
           */
      java.util.Enumeration<InetAddress> it = netif.getInetAddresses();
      InetAddress inetaddr = null;
      while (!(inetaddr instanceof Inet4Address) &&
          it.hasMoreElements()) {
        inetaddr = it.nextElement();
      }
      if (inetaddr instanceof Inet4Address) {
        ifaddr = inetaddr.getAddress();
      }
    }
    return isReachable0(addr.getAddress(), timeout, ifaddr, ttl);
  }

  private InetAddress anyLocalAddress;
  private InetAddress loopbackAddress;
}
